If you can walk you can snowshoe (well OK you need snow). When you snowshoe you can burn up to 45% more calories than walking or running at the same speed. Several factors contribute to this....first exercising in cold weather increases your metabolic rate, second you are walking with added weight on your feet and third there is added resistance walking through the snow. Add poles to help walk over hilly terrain and you can burn over 1,000 calories an hour.
Snowshoe yourself thinner this winter!